Code
B1379
FIAT
B — Body
Oil change reset button short to ground
AI status
Completed
Completed
100%
Causes
- Damaged or shorted wiring harness on the oil change reset switch circuit
- Corroded, bent, or damaged connector pins causing contact with ground
- Faulty oil change reset push-button (internal short)
- Aftermarket accessory or repair that contacted the circuit and tied it to ground
- Poor or missing chassis ground causing erroneous circuit behavior
- Faulty BCM/instrument cluster input or internal short
Symptoms
- Oil change reminder/reset function will not operate or cannot be reset
- Malfunction indicator or service light related to oil service may be displayed
- Stored B1379 code in BCM or instrument cluster memory
- Possible intermittent behavior of the reset button
- No change after attempting oil interval reset
What to check
- Read and record stored codes and freeze frame with a capable scan tool
- Visual inspection of switch, harness, and connectors for damage, corrosion, or pinouts
- Wiggle test the harness and switch while monitoring for code set or changes
- Check for continuity between the switch pin and chassis ground with switch disconnected
- Measure voltage at the BCM/switch input with ignition on and with the button pressed
- Inspect for aftermarket accessories or recent repairs in the area
Signal parameters
- Expected open-circuit voltage at BCM input: approx 5–12 V (dependent on vehicle pull-up)
- Expected closed (pressed) voltage at BCM input: near 0 V (ground) when switch is intentionally closed
- Resistance of switch closed: near 0 Ω; switch open: high/OL
- Unintended continuity to chassis ground when switch is disconnected indicates wiring short
- Current draw on the circuit should be very small (milliamps) — high current indicates short
Diagnostic algorithm
- Retrieve and record all related DTCs and vehicle details with a scan tool. Do not clear codes yet.
- Perform a careful visual inspection of the oil change reset button, surrounding trim, wiring harness, and connectors for damage, corrosion, or pin displacement.
- With ignition ON, backprobe the switch connector and measure voltage at the signal wire. Note voltage with button released and pressed. Compare to expected signal parameters.
- Disconnect the switch connector. Check continuity between the signal wire and chassis ground. There should NOT be continuity with the switch connector unplugged — continuity indicates a short to ground in wiring or connectors.
- If continuity to ground exists, trace the harness toward the BCM: separate sections, inspect loom, and use insulation/visual checks to find chafed areas. Repair or replace damaged wiring as required.
- If no continuity with the connector unplugged, test the switch itself: measure resistance across switch terminals while operating. Replace switch if internally shorted or out of tolerance.
- If wiring and switch check good, backprobe the BCM input pin and verify pull-up voltage and signal behavior. Compare to factory values. If BCM input is shorted internally, consult wiring diagrams and consider BCM replacement or module repair.
- After repairs, clear codes, perform the oil change reset procedure, and verify the code does not return. Road-test or cycle ignition multiple times to confirm repair.
- Safety note: disconnect battery only if required by repair procedures and follow manufacturer precautions for module programming and immobilizer systems.
Likely causes
- Short to ground at a connector near the switch (most common)
- Failed push-button that internally shorts to ground when released
- Pin pushed out of connector and contacting grounded chassis or bracket
- Wiring abrasion where loom rubs against body or harness clip
- Moisture or corrosion inside switch housing or connector
Fault status
Status
Oil change reset switch circuit short to ground detected. Inspect/reset push-button, wiring, connectors and BCM input for short to chassis ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for FIAT
26
Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
FIAT
-
FIAT: 2022
-
500X
-
-
FIAT: 2021
-
500X
-
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email